Q18. If the pH of a solution is 2, the concentration of H+ ions in this solution ([H+]) is: Select one: a. pH does not r

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Q18. If the pH of a solution is 2, the concentration of H+ ionsin this solution ([H+]) is:
Select one:
a.
pH does not relate to the [H+]
b.
[H+] is less than the [OH-]
c.
There is no H+ ions in the solution
d.
[H+] is greater than the [OH-]
e.
[H+] is equal to [OH-]
Q19.
In the balanced equation for the combustion of phenol,C6H5OH, the co-efficients x,y and z should have which of thefollowing values:
C6H5OH(l) + x O2(g)y CO2(g) + z H2O(g)
Select one:
a.
x = 7.5, y =3, z = 2
b.
x = 3, y = 6, z = 3
c.
x = 4, y =6, z = 3
d.
x = 7, y = 6, z = 2
e.
x = 7, y = 6, z = 3
Q20.
Consider the following balanced equation:
2 Al(OH)3(s) + 3H2SO4(aq) Al2(SO4)3(aq) + 6 H2O(l)
Assuming there is sufficient sulfuric acid for a completereaction, how many moles of aluminum hydroxide,Al(OH)3, are needed to form 4 moles ofwater?
Select one:
a.
1.33 moles
b.
13.3 moles
c.
3 moles
d.
0.75 moles
e.
2 moles